linux-kernel - [PATCH] media: stm32-dcmi: only enable IT frame on JPEG capture

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Date:   Mon, 24 Sep 2018 14:54:59 +0200
From:   Hugues Fruchet <hugues.fruchet@...com>
To:     Alexandre Torgue <alexandre.torgue@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>
CC:     <linux-media@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Yannick Fertre <yannick.fertre@...com>,
        Hugues Fruchet <hugues.fruchet@...com>
Subject: [PATCH] media: stm32-dcmi: only enable IT frame on JPEG capture

Only enable IT frame on JPEG capture, this saves some CPU
interruptions and processing on all the other cases.

Signed-off-by: Hugues Fruchet <hugues.fruchet@...com>
---
 drivers/media/platform/stm32/stm32-dcmi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index ba3e2ee..d6b00eda 100644
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -659,7 +659,10 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
 	}
 
 	/* Enable interruptions */
-	reg_set(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
+	if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG)
+		reg_set(dcmi->regs, DCMI_IER, IT_FRAME | IT_OVR | IT_ERR);
+	else
+		reg_set(dcmi->regs, DCMI_IER, IT_OVR | IT_ERR);
 
 	return 0;
 
-- 
2.7.4